package com.genersoft.iot.vmp.gb28181;

import java.util.Properties;

import javax.sip.DialogTerminatedEvent;
import javax.sip.IOExceptionEvent;
import javax.sip.ListeningPoint;
import javax.sip.RequestEvent;
import javax.sip.ResponseEvent;
import javax.sip.ServerTransaction;
import javax.sip.SipFactory;
import javax.sip.SipListener;
import javax.sip.SipProvider;
import javax.sip.SipStack;
import javax.sip.TimeoutEvent;
import javax.sip.TransactionAlreadyExistsException;
import javax.sip.TransactionTerminatedEvent;
import javax.sip.TransactionUnavailableException;
import javax.sip.address.AddressFactory;
import javax.sip.header.HeaderFactory;
import javax.sip.header.ViaHeader;
import javax.sip.message.MessageFactory;
import javax.sip.message.Request;
import javax.sip.message.Response;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

import com.genersoft.iot.vmp.conf.SipConfig;
import com.genersoft.iot.vmp.gb28181.transmit.SIPProcessorFactory;
import com.genersoft.iot.vmp.gb28181.transmit.request.ISIPRequestProcessor;
import com.genersoft.iot.vmp.gb28181.transmit.response.ISIPResponseProcessor;

import gov.nist.javax.sip.SipStackImpl;

@Component
public class SipLayer implements SipListener{
	
	private final static Logger logger = LoggerFactory.getLogger(SipLayer.class);
	
	@Autowired
	private SipConfig config;
	
	private SipProvider tcpSipProvider;
	
	private SipProvider udpSipProvider;
	
	@Autowired
	private SIPProcessorFactory processorFactory;
	
	private SipStack sipStack;
	
	private AddressFactory addressFactory;
	private HeaderFactory headerFactory;
	private MessageFactory messageFactory;

	@Bean
	private boolean initSipServer() throws Exception {
		SipFactory sipFactory = SipFactory.getInstance();
		sipFactory.setPathName("gov.nist");
		headerFactory = sipFactory.createHeaderFactory();
		addressFactory = sipFactory.createAddressFactory();
		messageFactory = sipFactory.createMessageFactory();
		
		Properties properties = new Properties();
		properties.setProperty("javax.sip.STACK_NAME", "GB28181_SIP");
		properties.setProperty("javax.sip.IP_ADDRESS", config.getSipIp());
		/**
		 * sip_server_log.log 和 sip_debug_log.log public static final int TRACE_NONE =
		 * 0; public static final int TRACE_MESSAGES = 16; public static final int
		 * TRACE_EXCEPTION = 17; public static final int TRACE_DEBUG = 32;
		 */
		properties.setProperty("gov.nist.javax.sip.TRACE_LEVEL", "16");
		properties.setProperty("gov.nist.javax.sip.SERVER_LOG", "sip_server_log");
		properties.setProperty("gov.nist.javax.sip.DEBUG_LOG", "sip_debug_log");
		sipStack = (SipStackImpl) sipFactory.createSipStack(properties);
		
		try {
			startTcpListener();
			startUdpListener();
		} catch (Exception e) {
			logger.error("Sip Server 启动失败！ port {"+config.getSipPort()+"}");
			e.printStackTrace();
			throw e;
		}
		logger.info("Sip Server 启动成功 port {"+config.getSipPort()+"}");
		return true;
	}
	
	private void startTcpListener() throws Exception {
		ListeningPoint tcpListeningPoint = sipStack.createListeningPoint(config.getSipIp(), config.getSipPort(), "TCP");
		tcpSipProvider = sipStack.createSipProvider(tcpListeningPoint);
		tcpSipProvider.addSipListener(this);
    }
	
    private void startUdpListener() throws Exception {
		ListeningPoint udpListeningPoint = sipStack.createListeningPoint(config.getSipIp(), config.getSipPort(), "UDP");
		udpSipProvider = sipStack.createSipProvider(udpListeningPoint);
		udpSipProvider.addSipListener(this);
    }

	/**
	 * SIP服务端接收消息的方法 Content 里面是GBK编码 This method is called by the SIP stack when a
	 * new request arrives.
	 */
	@Override
	public void processRequest(RequestEvent evt) {
		ISIPRequestProcessor processor = processorFactory.createRequestProcessor(evt);
		processor.process(evt, this, getServerTransaction(evt));
	}

	@Override
	public void processResponse(ResponseEvent evt) {
		Response response = evt.getResponse();
		int status = response.getStatusCode();
		if ((status >= 200) && (status < 300)) { // Success!
			ISIPResponseProcessor processor = processorFactory.createResponseProcessor(evt);
			processor.process(evt,this,config);
		} else {
			logger.warn("接收到失败的response响应！status："+status+",message:"+response.getContent().toString());
		}
		//trying不会回复
		if(status == Response.TRYING){

		}
	}

	/**   
	 * <p>Title: processTimeout</p>   
	 * <p>Description: </p>   
	 * @param timeoutEvent    
	 */  
	@Override
	public void processTimeout(TimeoutEvent timeoutEvent) {
		// TODO Auto-generated method stub
		
	}

	/**   
	 * <p>Title: processIOException</p>   
	 * <p>Description: </p>   
	 * @param exceptionEvent    
	 */  
	@Override
	public void processIOException(IOExceptionEvent exceptionEvent) {
		// TODO Auto-generated method stub
		
	}

	/**   
	 * <p>Title: processTransactionTerminated</p>   
	 * <p>Description: </p>   
	 * @param transactionTerminatedEvent    
	 */  
	@Override
	public void processTransactionTerminated(TransactionTerminatedEvent transactionTerminatedEvent) {
		// TODO Auto-generated method stub
		
	}

	/**   
	 * <p>Title: processDialogTerminated</p>   
	 * <p>Description: </p>   
	 * @param dialogTerminatedEvent    
	 */  
	@Override
	public void processDialogTerminated(DialogTerminatedEvent dialogTerminatedEvent) {
		// TODO Auto-generated method stub
		
	}
	
	private ServerTransaction getServerTransaction(RequestEvent evt) {
		Request request = evt.getRequest();
		ServerTransaction serverTransaction = evt.getServerTransaction();
		// 判断TCP还是UDP
		boolean isTcp = false;
		ViaHeader reqViaHeader = (ViaHeader) request.getHeader(ViaHeader.NAME);
		String transport = reqViaHeader.getTransport();
		if (transport.equals("TCP")) {
			isTcp = true;
		}

		if (serverTransaction == null) {
			try {
			if (isTcp) {
				serverTransaction = tcpSipProvider.getNewServerTransaction(request);
			} else {
				serverTransaction = udpSipProvider.getNewServerTransaction(request);
			}
			} catch (TransactionAlreadyExistsException e) {
				e.printStackTrace();
			} catch (TransactionUnavailableException e) {
				e.printStackTrace();
			}
		}
		return serverTransaction;
	}


	public AddressFactory getAddressFactory() {
		return addressFactory;
	}

	public HeaderFactory getHeaderFactory() {
		return headerFactory;
	}

	public MessageFactory getMessageFactory() {
		return messageFactory;
	}

	public SipProvider getTcpSipProvider() {
		return tcpSipProvider;
	}

	public SipProvider getUdpSipProvider() {
		return udpSipProvider;
	}
	
}
